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I 2 Sheets-Sheet I. J. LITTLE.

SAW MILL DOG.

No. 264,089. Patented Sept. 12, 1882.

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7 [y i Y J. LITTlf-Enl SAW MILII DOG.

Patented Sept. 12, 1882.

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JAMES LITTLE, OF EVANSVILLE, INDIANA, ASSIGNOR T() S. W. LITTLE, OF SAME IJLAGE.

SAW-MILL DOG.

SPECIFICATION forming part of,v Letters Patent No. 264,069, dated September 12, 1882.

Application led October 17, 1881. (No model.)

To all lwhom it may concern Be it known that I, JAMES LITTLE, a citizen of the United States, residing in Evansville, in the county of Vanderburg and State of Indiana, have invented a certain new and useful Improvementin Saw-Mill Dogs, of which the following is a specification. I

My invention relates to saw-mill dogs in which the dog-har is longitudinally adjustable 1o in a vertieally-siidinghead carried byarack-bar mounted upon a standard, in turn supported by an'd transversely adjustable of the traveling carriage carrying the log or timber to be sawed, and is an improvement upon a saw-mill dog for which Letters PatentNo. 221,176 were granted to me November 4, 1879.

The objects ofv my invention are to provide the sliding head with a lever ot' novel construction, engaging with the rack-har, and

zo adapted to not only adjust the height of the head, but to rigidly lock the head at any height upon the rack-bar, or to be shifted free of the rack-bar to enable the head to be raised or lowered by a direct and continuous movement without the operator having to remove his hand from the lever; to provide furthe longitudinal adjustment and locking ofthe dog upon the head by a simple and inexpensive means, not interfering with or impairingthe 3o direct sliding movement of the dog in the head when adjusting the dog; and, inally, to have the parts necessary for 4these adjustments so constructed asto render themcapable of each being cast in one piece, and thereby reduce the labor and cheapen the cost ot' prod ucing them. I attain these objects by devices illustrated in the accompanying drawings, in which- Figure l is a perspective ot' a mill-dog embodying my invention when in operation; Fig. 4o 2, a section through the center ot' length ofthe dog, showing the engagement ofthe head with the rack-bar and dogbar; Fig. 3, a section taken through the center of length of the rackbar, with the spring-actuated stud ot' the dog released from the head;v Fig. 4, a detail of the lever, with the bearings and rack indicated in dotted lines to show the disengagement of the lever from the rack; Fig. 5, a perspective of the head and lever with the dog-bar removed; 5o and Fig. G, a longitudinal section showing the lever locked to the head.

Similar letters ofreferenee indicate the sa me parts in the several figures of the drawings. y

A represents a portieri of a saw-mill cnrriage, supporting a standard, B, transversely adjustable along the carriage by the usual means, and in turn supporting a vertical rackbar, (l, rigidly secured in place and extending1 from near the base of to some distaneeabove the standard.'

Overlapping and guided upon the raclebar, as shown in Fig. 2, is a sliding head, B, slot; ted near its lower end to form parallel ears or lugs correspondingly recessed upon their opposing inner Vfaces to form an upper bearing, a, lower'bearing, b, and outer bearing, c, for a segment ratchet-lever, E, adapted to be engaged with the raclebar to raise and lower the head, and to be locked to the same by a stud,

d, forming a part of the lever. bearings are so arranged with reference to one another as to present the appearance ot' a trefoil, and they provide f'or shifting the i'ulcrum ofthe lever, enabling the lever to be released from or engaged with or locked to the raclnas will be presently explained. vertically-slid ing head1) is provided near its upper end with a transverse T-shaped groove,forminga guideway for the dog-bar F, consisting ot a liat bar provided with a tooth extending downwardly 8o at a right angle and adapted to pierce and clamp the log or timber in the usual manner t0 the carriage and against the upright. The head is provided with a rou7 ot' pertorations in horizontal series, one ot' which is indicated at 85 e, to receive a headed stop,G, passing through a perforation in the d'og to lock the dog` to the head. These pertorations are connected by a. groove, (shown atf in Fig. 5,) not extending to the sides of the head, but only connecting the 9o series of perforations, to permit the stop to be released from the perforations and the dog shifted without a liability of accidentally shoving it entirely out ot' the head, or so far as to carry the stop beyond the 'limit ot the perfo- 95 rations.

Secured on the face and toward the forward end ofthe dog by a screw, g, is a straight spring, h, the opposite end of which is slotted These several 7o ting the end of the spring not only renders it easy of attachment but enables it to have a longitudinal play and not pinch the stop and cause the stop to bind in the perforation, as would be the case if the spring were perforated to tit closely around the stop.

Passing through the spring intermediate its ends, and entering the dog, is a screw, i, which serves not only to limit the stroke to prevent such bending as would destroy the tension or break the spring, but to limit the play of the stop, so that it may not be lifted clear of the groove connecting the perforations in the head.

In operation the dog-bar is adjusted in the head. by taking hold of and drawing out the stop, then pushing against the stop to slide the dog-bar in the head, the two movements being` made with one hand and without the necessity of taking hold ofthe dog-bar. After the dog-bar is adjusted, with its point resting on the timber or log, and the operating-lever raised, as shown in Fig. l, with its bearing at b, as shown in Fig. 3, the end of the lever is depressed, which results in drawing down the head and forcing the dog-bar in the timber to hold it in place. When the dog-bar is once set the lever is released from the rack-bar by vslightly raising and shifting its fulcrum to bearing c, When, by raising the segment to shift the fulcrum of the lever to the bearing a, and at the saine time engaging the segment with the rack-bar, the stud d Will pass inside the head and lock the lever to the head, as clearly shown in Fig. 6, holding the dog rigidly in the timber until the locking-stud is released; but the principal object of this stud is to lock the head to the rack above the operative position of the head and dog-bar and out of the way when shifting the log, a'nd this may be done when the head is depressed by shifting the fulcrum of the lever to the bearing c to free it from the rack, then elevating the. head and shitting the fulcrum to the upper bearing, then b v holding the lever in the bearing and depressing the end of the lever until the stud d enters the slot ofthe head, as shown. rlhis locking-stud not only serves the purpose just described, but, by its contact with the head when operating the lever, limits the downward stroke ot' the lever to prevent its accidental detachment from the rack when depressing the dog-bar. The trefoil bearing provides for shifting the fulcruin of the lever to three different positions relative to the rack-bar, and

is a simple and efficient means for enabling the lever to perform the functions above described, and for dispensing with numerous and complicated devices for attaining the same result. As shown, the handle ot' the lever is separated for convenience in casting and shipping; but of course it may be cast in one piece.

Having nonT described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination, With a rack-bar and a sliding head provided with several bearings, of an operating-lever having a shifting fulcrum to (so-operate with the said bearings, substantially as described.

2. ln a saw-mill dog, the combination, with a sliding head provided with several distinct bearings, of an operating-lever the fulcruin of which can be set in either of said bearings, substantially as described.

3. In a saw-mill dog, the combination, with a sliding head, of an operating-lever provided with the rigid locking lug or projections engaging with said head to lock the lever, substantially as described.

4. In a saw-mill dog, the combination, with a sliding head provided With several bearings,

of an operating-lever adapted to be set in either of said bearings, and provided with the rigid locking lug or projection engaging with said head to lock the lever, substantially as described.

5. In a sawmill dog, the combination, with a rack-bar and a sliding head, of an operatinglever having a segmentgear to engage with said rack, and provided with the rigid locking lug or projection engaging with said head, substantially as described.

6. In a saw-mill dog, the combination, With a dog-bar provided with a single hole and a stop or set pin, of a sliding head having a series ot' perforations to receive said pin, substantially as described.

7. ln a saw-mill dog, the combination, with a sliding head having a series of perl'orations and a groove or channel connecting the same, ot' all adjustable dog-bar provided with a single hole, a stop-pin, and a retaining spring to hold said pin in place.

JAMES LITTLE. Witnesses:

WM. H. MILLER, JOHN H. MADDocK.

IOO 

